A “big (heavy or bulky) lizard” from Late Cretaceous New Jersey and New Mexico (USA) and Alberta (Canada). It was discovered by William Parker Foulke (and named in his honor as Hadrosaurus foulkii) and excavated and named by anatomist and paleontologist Joseph Leidy in 1858. This creature was formerly known as Gryposaurus, Kritosaurus, and Ornithotarsus.